packaging: add Bullseye, remove Jessie
Jessie is oldoldstable now, and Bullseye is going to be the next stable (now
testing). We're continuing to support the current oldstable, stable and testing
releases.
Differential Revision: https://phab.mercurial-scm.org/D6762
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.